When I am utilizing the computing resources and infrastructure of any "employer", "client", "organization" other than my own, I have no expectation of privacy or security. An "Appropriate Use" policy is normally in place.
I assume that every key stroke, every click, everything is being recorded and monitored. But then, I am cognizant of these practices because part of my host of tricks is that I'm an information security professional. So, I have to know these things. Not everybody may be yet fully aware even in this day and age.
I certainly hope that the State of Florida Legislature has a "Appropriate Use" policy by which even legislators must abide.
To clarify, my comment about him being "scum" is (as Zombie highlighted) primarily based on his threat of attempting to silence freedom of the press, AND an assumption that he surely must be violating an Appropriate Use policy.
An example of a time I could see that "porn" might be ethically and legitimately be viewed on the floor of a legislative body is during a debate on pending legislation concerning "porn".
Legislators, by nature of the grant of public trust which we place with them, should hold themselves to higher standards of conduct.
And, that violation of public trust is why that senator is, in my view, scum.